102 lines
1.6 KiB
ArmAsm
102 lines
1.6 KiB
ArmAsm
; file: head.s
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;
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[BITS 32]
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%include "base.inc"
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%include "multiboot.inc"
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MULTIBOOT_MAGIC equ 0x1BADB002
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MULTIBOOT_ALIGN equ 1 << 0
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MULTIBOOT_MEMINFO equ 1 << 1
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MULTIBOOT_FLAGS equ MULTIBOOT_ALIGN | MULTIBOOT_MEMINFO
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section .multiboot
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align 4
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dd MULTIBOOT_MAGIC
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dd MULTIBOOT_FLAGS
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dd -(MULTIBOOT_MAGIC + MULTIBOOT_FLAGS)
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section .bss
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align 16
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stack_bottom:
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resb 16384
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stack_top:
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section .text
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; Function: entry
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;
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; in:
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; EAX - Multiboot magic
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; EBX - Multiboot structure
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;
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; out:
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; none
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;
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global entry
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entry:
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mov esp, stack_top
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cli
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mov edi, eax
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mov esi, ebx
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;; initialize serial (mostly used for debug)
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extern serial_init
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call serial_init
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;; eax <- magic
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;; ebx <- multiboot struct
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cmp edi, 0x2BADB002
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je .multiboot_valid
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LOG err_invalid_boot_magic, edi
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jmp hang
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.multiboot_valid:
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LOG msg_hello_world
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mov eax, [esi + mb_info.bootloader_name]
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LOG msg_boot_info, eax
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extern setup_gdt
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call setup_gdt
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extern setup_pic
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call setup_pic
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extern setup_idt
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call setup_idt
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push esi
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extern setup_pmm
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call setup_pmm
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add esp, 4
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test eax, 0
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jz .mem_ok
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LOG err_cannot_map_memory
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jmp hang
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.mem_ok:
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LOG msg_pmm_initialized
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extern setup_paging
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call setup_paging
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hang:
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cli
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hlt
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jmp hang
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section .rodata
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msg_hello_world db "StupidOS v", STUPID_VERSION, " (built with ", NASM_VERSION, " on ", BUILD_DATE, ")", 0
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msg_boot_info db "Bootloader: %s", 0
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msg_pmm_initialized db "PMM initialized", 0
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err_invalid_boot_magic db "[ERROR] Invalid boot magic (got: %x, expected: 0x2BADB002)", 0
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err_cannot_map_memory db "[ERROR] Can't map memory", 0
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file db __FILE__, 0
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